Income Taxes - Summary of Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (15,576)	$ (5,251)	$ (43,922)	$ (29,509)
Provision (benefit) for income taxes	$ 1,502	$ (942)	$ 3,375	$ 2,302
Effective tax rate	(9.60%)	17.90%	(7.70%)	(7.80%)